{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CAXGUNVQRB3WEP3POXJ4BT5DVH","short_pith_number":"pith:CAXGUNVQ","canonical_record":{"source":{"id":"2107.12750","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-07-27T11:46:08Z","cross_cats_sorted":["physics.comp-ph","physics.ins-det"],"title_canon_sha256":"2cd8d34f04e5dd18b91818d97b311ab0ecfde7d6975359a8036d011ba0e448d9","abstract_canon_sha256":"736881f3fc780b666d9a45ef0e99464bb6ddf26dfbf3372246a1dd99092bda1d"},"schema_version":"1.0"},"canonical_sha256":"102e6a36b08877623f6f75d3c0cfa3a9c6ef569b882781d124c77cc09e4ddcc1","source":{"kind":"arxiv","id":"2107.12750","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.12750","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"arxiv_version","alias_value":"2107.12750v1","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.12750","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_12","alias_value":"CAXGUNVQRB3W","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_16","alias_value":"CAXGUNVQRB3WEP3P","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_8","alias_value":"CAXGUNVQ","created_at":"2026-07-05T03:09:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CAXGUNVQRB3WEP3POXJ4BT5DVH","target":"record","payload":{"canonical_record":{"source":{"id":"2107.12750","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-07-27T11:46:08Z","cross_cats_sorted":["physics.comp-ph","physics.ins-det"],"title_canon_sha256":"2cd8d34f04e5dd18b91818d97b311ab0ecfde7d6975359a8036d011ba0e448d9","abstract_canon_sha256":"736881f3fc780b666d9a45ef0e99464bb6ddf26dfbf3372246a1dd99092bda1d"},"schema_version":"1.0"},"canonical_sha256":"102e6a36b08877623f6f75d3c0cfa3a9c6ef569b882781d124c77cc09e4ddcc1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:09:47.035531Z","signature_b64":"DSCE81L61TaZj6Kb6ZtaLyOE41dhfOjrqjLxwIbGRQSQuolKMZHSKt4ynOvSJWGVv9TbNQ16rbnzl5pzdLpRBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"102e6a36b08877623f6f75d3c0cfa3a9c6ef569b882781d124c77cc09e4ddcc1","last_reissued_at":"2026-07-05T03:09:47.035074Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:09:47.035074Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2107.12750","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:09:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TiHCKh/xEoIOdo+oew0yaqurKp4TRJzrIT6jNZMlbL6/2zrmjAnFBGHMQro7OmA5egfMf5RvXsCzC2YfHpLcDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T04:46:13.068225Z"},"content_sha256":"2b8809bbd89ecb5227e948eb04e6e638c727932aca9e70173a84c9875329707e","schema_version":"1.0","event_id":"sha256:2b8809bbd89ecb5227e948eb04e6e638c727932aca9e70173a84c9875329707e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CAXGUNVQRB3WEP3POXJ4BT5DVH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimisation of the event-based TOF filtered back-projection for online imaging in total-body J-PET","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["physics.comp-ph","physics.ins-det"],"primary_cat":"physics.med-ph","authors_text":"A. Gajos, B. C. Hiesmayr, C. Curceanu, D. Kisielewska, E. Czerwi\\'nski, E. Kubicz, E.L. St\\c{e}pie\\'n, F. Tayefi, G. Korcyl, J. Raj, K. Dulski, K. Kacprzak, K. Klimaszewski, {\\L}. Kap{\\l}on, L. Raczy\\'nski, M. Dadgar, N. Chug, N. Krawczyk, P. Kopka, P. Kowalski, P. Moskal, R.Y. Shopa, Shivani, S. Sharma, Sz. Nied\\'zwiecki, W. Krzemie\\'n, W. Wi\\'slicki","submitted_at":"2021-07-27T11:46:08Z","abstract_excerpt":"We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back $\\gamma$-photons. The optimisation of its parameters is studied using Monte Carlo simulations of a 1-mm spherical source, NEMA IEC and XCAT phantoms inside the ideal J-PET scanner. The combination of high-pass filters which included the TOF filtered back-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.12750","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.12750/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:09:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eDi8adT9zVrImJMjZy2YT50SE//bp6pXN/E/txhJJXeDVTKHw/EjrkGinXZOPuIfPwwSwfUHSqEYi3y2TwZ/Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T04:46:13.069063Z"},"content_sha256":"cc8302247062c78ee17b284957b2986acc80fd3a4b267533407f70ba002415ca","schema_version":"1.0","event_id":"sha256:cc8302247062c78ee17b284957b2986acc80fd3a4b267533407f70ba002415ca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/bundle.json","state_url":"https://pith.science/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T04:46:13Z","links":{"resolver":"https://pith.science/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH","bundle":"https://pith.science/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/bundle.json","state":"https://pith.science/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CAXGUNVQRB3WEP3POXJ4BT5DVH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CAXGUNVQRB3WEP3POXJ4BT5DVH","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"736881f3fc780b666d9a45ef0e99464bb6ddf26dfbf3372246a1dd99092bda1d","cross_cats_sorted":["physics.comp-ph","physics.ins-det"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-07-27T11:46:08Z","title_canon_sha256":"2cd8d34f04e5dd18b91818d97b311ab0ecfde7d6975359a8036d011ba0e448d9"},"schema_version":"1.0","source":{"id":"2107.12750","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.12750","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"arxiv_version","alias_value":"2107.12750v1","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.12750","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_12","alias_value":"CAXGUNVQRB3W","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_16","alias_value":"CAXGUNVQRB3WEP3P","created_at":"2026-07-05T03:09:47Z"},{"alias_kind":"pith_short_8","alias_value":"CAXGUNVQ","created_at":"2026-07-05T03:09:47Z"}],"graph_snapshots":[{"event_id":"sha256:cc8302247062c78ee17b284957b2986acc80fd3a4b267533407f70ba002415ca","target":"graph","created_at":"2026-07-05T03:09:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2107.12750/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We perform a parametric study of the newly developed time-of-flight (TOF) image reconstruction algorithm, proposed for the real-time imaging in total-body Jagiellonian PET (J-PET) scanners. The asymmetric 3D filtering kernel is applied at each most likely position of electron-positron annihilation, estimated from the emissions of back-to-back $\\gamma$-photons. The optimisation of its parameters is studied using Monte Carlo simulations of a 1-mm spherical source, NEMA IEC and XCAT phantoms inside the ideal J-PET scanner. The combination of high-pass filters which included the TOF filtered back-","authors_text":"A. Gajos, B. C. Hiesmayr, C. Curceanu, D. Kisielewska, E. Czerwi\\'nski, E. Kubicz, E.L. St\\c{e}pie\\'n, F. Tayefi, G. Korcyl, J. Raj, K. Dulski, K. Kacprzak, K. Klimaszewski, {\\L}. Kap{\\l}on, L. Raczy\\'nski, M. Dadgar, N. Chug, N. Krawczyk, P. Kopka, P. Kowalski, P. Moskal, R.Y. Shopa, Shivani, S. Sharma, Sz. Nied\\'zwiecki, W. Krzemie\\'n, W. Wi\\'slicki","cross_cats":["physics.comp-ph","physics.ins-det"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-07-27T11:46:08Z","title":"Optimisation of the event-based TOF filtered back-projection for online imaging in total-body J-PET"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.12750","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:2b8809bbd89ecb5227e948eb04e6e638c727932aca9e70173a84c9875329707e","target":"record","created_at":"2026-07-05T03:09:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"736881f3fc780b666d9a45ef0e99464bb6ddf26dfbf3372246a1dd99092bda1d","cross_cats_sorted":["physics.comp-ph","physics.ins-det"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.med-ph","submitted_at":"2021-07-27T11:46:08Z","title_canon_sha256":"2cd8d34f04e5dd18b91818d97b311ab0ecfde7d6975359a8036d011ba0e448d9"},"schema_version":"1.0","source":{"id":"2107.12750","kind":"arxiv","version":1}},"canonical_sha256":"102e6a36b08877623f6f75d3c0cfa3a9c6ef569b882781d124c77cc09e4ddcc1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"102e6a36b08877623f6f75d3c0cfa3a9c6ef569b882781d124c77cc09e4ddcc1","first_computed_at":"2026-07-05T03:09:47.035074Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:09:47.035074Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DSCE81L61TaZj6Kb6ZtaLyOE41dhfOjrqjLxwIbGRQSQuolKMZHSKt4ynOvSJWGVv9TbNQ16rbnzl5pzdLpRBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:09:47.035531Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.12750","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2b8809bbd89ecb5227e948eb04e6e638c727932aca9e70173a84c9875329707e","sha256:cc8302247062c78ee17b284957b2986acc80fd3a4b267533407f70ba002415ca"],"state_sha256":"aa998b248b85d80c1d736deea12ef6cfc4d284f16daec6fb6ef956015ea64993"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wZr0jH46bbpw9Qk/hdbi0tfm08es+3yhb1sjj2ays66iTw4OE6BogSIY/YSmchn+SAnRQVuugsgKC20ZuYxeBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T04:46:13.073463Z","bundle_sha256":"f6a1015dfdab4370616fbdc8191c40e11b83da3fbc067d88aeb9cc76b13c75c6"}}